Meet the 30 Under 30 Coolest Entrepreneurs

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Kevin Systrom and Mike Krieger, Instagram

This photo-sharing smart-phone application has been downloaded by four million people who use it to add stylistic filters, frames, and effects to photos. Founders Kevin Systrom and Mike Krieger, who both went through Stanford's Mayfield Fellows program, now have $7 million in funding and are focused on becoming "a leader in the mobile space." Read more.